Electrical apparatus



May 17, 1932. c. H. HILL I I ELECTRICAL APPARATUS Original Filed Dec. 51, :1927

H W 5 m C w Patented May :17, 1932 UNITED STATES PATENT orslcs GELBLESEHILL,

OI HILL, PENNSYLVANIA, ASSIGNOB TO emmau. EEG- 'IBIC COMPANY, A. CORPORATION OF NEW YORK I ELECTRICAL .AIPPARATUB Original application fled My invention relates to electrical apparatus and .particularl to switching apparatus of the metal-cla type wherem current carrying partsare immersed in an insulating I fluid and insulated thereby from an outer metallic and conducting enclosing structure. An object of my invention'is the provision of an improved metal-clad a paratus hav ng a construction which is st which faclhtates convenience of assembly and inspection, and .which is efiicient in operation.

This application is a division of my apphcation Serial No. 243,977 for electric sw1tch-' mgiapparatus, filed December 31, 1927 y invention will be more fullyset forth in the following description, referring to the accompanying drawings, and the features of novelty which characterize my inventionwill be pointed out with particularity in the claimsannexed to and forming a part of this's ificatiom.

Re erring to the drawings, Fig. 1 is a per spectiv'e view of a apparatus embodying my invention; Fig. 2 1s a part al side elevation thereof, partly in section; F 12. 3 is a detailed view, partly in section, of a? ratus illustrated inFigs. 1 and 2, and ig. 4 is a fragmentary elevational view, partly m section, of metal clad structure embodying -my invention.

In the drawings there is illustrated by way of example a unit of electrical switching a paratus wherein the frame 1 is shown as fa December 31, 1827, Serial No. 8,977. Divided and this application filed January 2, 1980. Serial 1T0. 417,940.

live portions of the apparatus are enclosed in metallic casings from which they are separated in most parts by insulating oil or compound, hence the termimetal clad which has commonly been applied to this type of in switching apparatus.

, Supported on the top of the frame 1 is the bus bar chamber .or trough 2 extending through which are shown the three bus hrs. 3 of a three phase circuit. Also supportegfin the frame are the casings 4 and 5 containin respectively the usual current and potenlifi" transformers, connections 6 be' shown at. the bottom of easing 4 for incom ng or outgoing cables, depending on the use of the apparatus. The connections between current transformers in casing 4 and the bars are enclosed by the casing 7. Two flattened tubular casings -8 and 9 each enclose agroup of three fixed disconnectingswitchcontacts 10 supported by rods 11, the rods of one group of which connect b straps 12 with the respective bus bars' 3. T e main switch unit comprising the oil switch 14 its operating mechanism 15 and the movable contacts 70 16 of the disconnecting switch is removably mounted in the frame and ada ted to be raised lowered therein whereby the disconnectin' switch contacts may be caused respective y to engage and disen each other. I employ any suitable true or raising and lowering the main switch unit and for transporting it when separated from the a ricated from structural steel members welded mm together, forming a sup the main switch unit, connecting switch contacts, and the trans formers, etc. associatedtherewith.

rting structure for 0. bus bars, the dis-- A plurality of similar units may be 'ar-' e. That portion of the frame which encloses the main switch unit is open at the front through which the unit is removable and within the frame is the yoke 18 having on its two sides the guide lugs 19 which en ge on; opposite sides of the guides 20 fixer? to the frame. Internally the yoke has the guides 21 on its two sides which are engaged by suitable lugs or projections on the oil switch. 7 At the rear, the yoke is provided with lugs 22 and 23 havingtheir adjacent faces inclined.

The oil switch has a projectin rtion 24 having correspondingly inclin aces which when the switch is ushed rearwardly engage lugs 22 and 23 an firmly secure the switch at therear to the yoke. At the front the oil switch is secured to the yoke by the screws 25 which pass through the plate 27 formin a art of the switch into the ends of the-yo e.

y drawing up on these screws 25 the switch is pushed rearwardly against the lugs 22 and 23 and when thus en switch is firmly hel against such violent movements as might inJure the disconnecting switch contacts. In Fig. 3 the oil switch is shown removed and the yoke is shown in its lowermost position when it rests upon the angle 29. After the oil switch has been brought up to the frame by the carriage, it is slid into place in the yoke and the clamping screws 25 firmly secure it in the yoke. The switch and yoke are then raised together by suitable lifting means preferably mounted on the carria in a well known manner and which need not here be described. As the switch is raised, disconnecting switch contacts 16 and 10 engage the one within the other whereby the main or oil switch contacts are connected to the circuit. When the switch and the yoke have been raised the proper distance they are locked in the raised position by the locking bars 30. Each bar has a handle 31 and plates 32 which are ada ted to slide in grooves 33 formed in the gui es 20. In the lockin position the plates 32 engage the lugs 19 an support the switch and yoke. As a result of this construction the locking bars may be comparatively li ht and need be moved only enough to shift the plates from one position to the other. The bars may be secured in looking position by means such for example as a padlock 35 applied to the members 36.

Inasmuchas the disconnectin switch contacts 10 and 16 are not adapted or interrupting the circuit controlled by the oil switch or even for finally closing the same, there may be provided suitable means, such as disclosed in the parent application previously referred to, for automatically tripping open the oil switch and also for locking the switch operating mechanism against movement to closed circuit position in the event that one should begin to lower the oil switch when in closed circuit position.

I have illustrated the main oil switch prov'ided with a. solenoid actuated operating mechanism of a well known construction comprising the main opera-tingl lever 68 which may be 0 erated either by t e solenoid or by hand an the adjustable link 69 connecting it to the crank 57 of the switch.

As shown in Fig. 1 the three bus bars 3 are enclosed in the bus chamber or trough 2. When a plurality of switching apparatus side by such as that illustrated are arrange aged in the yoke theaaaaaoo side in a row, the respective bus bars and troughs are connected one with another to of the trough and bolted along the riphery to an inwardly extendingflange .2 on the tfloubgh. These partitions not only support t e us bars but serve to retain the insulating liquid 73 in all of that rtion of the trou between them. For ma in the 'oints tig t between the partitions an the, us bars I have shown gaskets 74 surrounding the bus bars and lying in recesses in the adjacent faces of the partitions. Gaskets may also be used if necessary between the partitions and the flanges to which the are b0 ted. The top of the trough is close b a cover plate 75 bolted to the trou h and y the removal of this plate access is ad to the connections between bus bars. In accordance with this construction an one apparatus of a row may be disconnec and removed from the rest. it bein necessary only to drain out the insulatin iquid contained in the relatively small en portions or spacing chambers of the troughs, the main or body portions of the troughsbeing undisturbed.

Referring now particularly to Fig. 4, it

will be seen that flattened metal casings 8 and cases be dissipated with suflicient rapidity, I

have provided a ventilating space between the insulatingtubes 78 and fixed contacts and parts associated therewith and in the bases of the supporting member 79 I have provided lateral openings 80 which communicate with those spaces. Since the lower ends of the tubes 78 are never entirely closed a cooling current of air is free to flow up past each of the disconnecting switch contacts and cool the same;

It shall, of course, be understood that the bus chamber 2 may be adapted for other portions of the circuit and that its use is not restricted to a metal-clad switching unit as illi strated.

tachablecover structure for the upper side of said trough section and transverse partitions mounted within said trough section adjacent the opposite ends thereof and making a liquid tight joint with the bus bars and the trough section.

2. In an electric switching metal clad unit, a bus bar trough section adapted to contain insulating liquid and arranged to be connected at its ends to trough sections of similar units, spaced bus bars in said section adapted to be connected to corresponding bus bars in adjacent sections, and insulating bus bar supporting partitions in said section spaced from the ends thereof forming a liquid tight joint with the bus bars and the trough section, said partitions forming with the adjacent partitions of adjoining units spacing chambers.

3. In a metal-clad switchgear unit, bus bar insulating structure comprising a trough-like section, said section havin transverse partitions at the, opposite en s thereof thereby forming an individual fluid-containing receptacle, sectionalized bus barsdisposed within said receptacle and immersed in an insulating'oil contained therein to form an oil-filled sectionalized unit, and detachable cover structure for each sectionalized unit. e

4. Electrical metal-clad structure comprising a plurality of bus bars, said bus bars each having individual sections adapted to be joined together to form a continuous conductor, a metallic trough-like rece tacle within I which the res tive phases 0 a particular section of the us'bars are disposed, each of said receptacles having end walls and cover structure forming an individual receptacleand metal-clad unit for the bus bar sections, and an insulating oil in said receptacle within which the bus bar sections are immersed,

an insu ating oil for insulating the bus bars from each other and from said trough section, said insulating partitions havin openings through which the ends of the us bar sections extend, and means at opposite ends of each trough section for uniting similar trough sections to each other to form a continuous metal-clad structure wherein corresponding ends of bus bar sections are united within spacing chambers formed by adjacent partitions of adjoining trough sections. In witness whereof, I have hereunto set my hand this 30th day of December, 1929.

CHARLES H. HILL. 

